The symptoms of an allergic reaction can vary widely from person to person. For some, sneezing and a runny nose may be as bad as it gets; for others, an allergy can be a serious, life-threatening condition. Common symptoms include: 

• Sneezing
• Runny nose or nasal congestion
• Coughing
• Itchy eyes, ears, nose or mouth
• Sinus pain
• Swelling
• Wheezing or shortness of breath
• Urticaria (nettle rash or hives)
• Sickness, vomiting, diarrhoea.

Anaphylactic shock is a very rare, severe form of allergic reaction that can be life-threatening if it is not treated immediately. During this type of reaction, the whole body reacts to the allergen, usually within a few minutes of coming into contact with it. Symptoms may include difficulty swallowing, speaking or breathing; swelling of the throat and mouth; a rash anywhere on the body; red or itchy skin; stomach cramps, nausea and vomiting; a sudden feeling of weakness; and collapse and unconsciousness. The most common cause of anaphylactic shock is an allergy to insect stings,; certain medication such as antibiotics; nuts or other types of food, e.g. dairy or seafood. An immediate injection of adrenalin into the muscles will help. Sufferers who know they are susceptible should carry an auto-injection kit with them just in case.

Research shows that 62 per cent of hayfever sufferers find their medication to be ineffective